Not sure if anyone said this already but I'm sure, well when I went to school, a day consists of 24hrs (approx) , so the only sleep at night will be wrong as night is part of the given day. Your birthday does not start when the sun comes up or end when the sun goes down. They equally start and finish at midnight.

Everyone that has said that he could sleep at night is wrong because a whole day is twenty four hours long not twelve hours long and the night still counts as the day it is just a different part of each day